CN107502714A - A kind of Technology for Heating Processing for effectively improving cutting rolled steel performance - Google Patents
A kind of Technology for Heating Processing for effectively improving cutting rolled steel performance Download PDFInfo
- Publication number
- CN107502714A CN107502714A CN201711008032.6A CN201711008032A CN107502714A CN 107502714 A CN107502714 A CN 107502714A CN 201711008032 A CN201711008032 A CN 201711008032A CN 107502714 A CN107502714 A CN 107502714A
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- Prior art keywords
- air
- steel
- cooled
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- effectively improving
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/32—Soft annealing, e.g. spheroidising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/004—Dispersions; Precipitations
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a kind of Technology for Heating Processing for effectively improving cutting rolled steel performance, comprise the following steps that：Charging, preheating, normalizing, water cooling, air-dried, preheating, annealing, air-cooled, discharging；Feed first, steel are sent into normalizing furnace, are pre-heated to 600 DEG C, 10min is kept, then carries out normalized treatment, the laggard water-filling of normalized treatment is cold, air-dried after water cooling to normal temperature, the steel are sent into annealing furnace after air-drying, are first preheated to 500 DEG C, keep 30min, then carry out spheroidizing, it is then air-cooled, air-cooled to after normal temperature, discharging.Through the above way, the present invention can make intrapearlitic globular cementite in steel and proeutectoid cementite be changed into pelletiod, it is uniformly distributed in ferrite matrix, so that the hardness of steel is low, machinability is good, cold deformability is big, facilitates later stage machining.
Description
Technical field
The present invention relates to steel Technology for Heating Processing, more particularly to a kind of heat treatment work for effectively improving cutting rolled steel performance
Skill.
Background technology
Technology for Heating Processing generally comprises three heating, insulation, cooling processes, only heats and cool down sometimes two processes.
These processes overlap, and can not be interrupted.Heating is one of important procedure of heat treatment.The heating means of metal heat treatmet are very
It is more, it is that liquids and gases fuel is closely applied as thermal source using charcoal and coal earliest.The application of electricity makes heating easily controllable,
And non-environmental-pollution.It can be directly heated, can also be carried out by the salt or gold of melting down to floating particles using these thermals source
Indirectly heat.During METAL HEATING PROCESS, workpiece exposes in atmosphere, it occur frequently that oxidation, decarburization (i.e. steel-iron components carbon contents drop
It is low), this has very negative impact for the surface property of part after heat treatment.Thus metal generally should be in controlled atmosphere or protection
Heated in atmosphere, in fuse salt and in vacuum, it is also possible to which coating or packing method carry out protection heating.Heating-up temperature is heat treatment
One of important technical parameter of technique, selection and control heating-up temperature, are the subject matter for ensureing thermal treatment quality.Heating-up temperature
It is different and different with the purpose of heat treatment with processed metal material, but be typically all to be heated to more than phase transition temperature, to obtain
High temperature microstructure.Transformation needs the regular hour in addition, therefore when surface of workpiece reaches the heating-up temperature of requirement, Hai Xu
This temperature is kept for certain time, is made internal and external temperature consistent, is made Microstructural complete, this period is referred to as soaking time.Adopt
With high-energy-density heating and during Surface heat-treatent, firing rate is exceedingly fast, and general just do not have a soaking time, and the guarantor of thermo-chemical treatment
The warm time is often longer.
The method for carrying out Technology for Heating Processing to steel has a lot, and cutting rolled steel performance can be effectively improved by how designing one kind
Technology for Heating Processing, reduce steel strength, meet follow-up machining, be one be made research the problem of.
The content of the invention
The present invention solves the technical problem of provide a kind of Technology for Heating Processing for effectively improving cutting rolled steel performance, energy
Intrapearlitic globular cementite in steel and proeutectoid cementite is all changed into pelletiod, be uniformly distributed in ferrite
In matrix, so that the hardness of steel is low, machinability is good, cold deformability is big, facilitate later stage machining.
In order to solve the above technical problems, one aspect of the present invention is：Offer one kind effectively improves steel and cut
The Technology for Heating Processing of performance is cut, is comprised the following steps that：Charging, preheating, normalizing, water cooling, air-dry, preheating, annealing, it is air-cooled,
Discharging；Feed first, steel are sent into normalizing furnace, be pre-heated to 600 DEG C, keep 10min, then carry out normalized treatment, just
The laggard water-filling of fire processing is cold, is air-dried after water cooling to normal temperature, and the steel are sent into annealing furnace after air-drying, are first preheated to
500 DEG C, 30min is kept, then carries out spheroidizing, then air-cooled, air-cooled to after normal temperature, discharging.
In a preferred embodiment of the present invention, the normalized treatment stage, Control for Kiln Temperature keep 1.5h at 950 DEG C, with
Afterwards with 150 DEG C/h speed, 300 DEG C are cooled to.
In a preferred embodiment of the present invention, the spheroidizing stage, furnace temperature is promoted to 920 DEG C first, kept
1h, furnace temperature is then reduced to 860 DEG C, keeps 1h, according to step cycle described above 4 times, furnace temperature is reduced to 500 DEG C, knot
Beam spheroidizing.
The beneficial effects of the invention are as follows：The present invention can make intrapearlitic globular cementite and pro-eutectoid in steel
Cementite is all changed into pelletiod, is uniformly distributed in ferrite matrix, so that the hardness of steel is low, machinability is good, cold
Deformability is big, facilitates later stage machining.
Embodiment
Presently preferred embodiments of the present invention is described in detail below so that advantages and features of the invention can be easier to by
It will be appreciated by those skilled in the art that apparent clearly defined so as to be made to protection scope of the present invention.
The embodiment of the present invention includes：
A kind of Technology for Heating Processing for effectively improving cutting rolled steel performance, is comprised the following steps that：Charging, preheating, normalizing, water cooling,
Air-dry, preheat, anneal, be air-cooled, discharging；Feed first, steel are sent into normalizing furnace, be pre-heated to 600 DEG C, keep
10min, normalized treatment is then carried out, the laggard water-filling of normalized treatment is cold, is air-dried after water cooling to normal temperature, by the steel after air-drying
Material is sent into annealing furnace, is first preheated to 500 DEG C, is kept 30min, is then carried out spheroidizing, then air-cooled, air-cooled to normal temperature
Afterwards, discharge.
Further illustrate, the normalized treatment stage, Control for Kiln Temperature keeps 1.5h at 950 DEG C, then with 150 DEG C/h speed
Rate, it is cooled to 300 DEG C.Normalized treatment is carried out to steel, the net carbide in structure of steel product can be effectively eliminated, be follow-up ball
Annealing carries out tissue preparation.
Further illustrate, the spheroidizing stage, furnace temperature is promoted to 920 DEG C first, 1h is kept, then by furnace temperature
It is reduced to 860 DEG C, keeps 1h, according to step cycle described above 4 times, furnace temperature is reduced to 500 DEG C, terminates spheroidizing.Adopt
With annealing process, the undissolved carbide particle in steel and local high-carbon regions can be made to form carbide core and localized clusters
Nodularization, so as to obtain nodularization body tissue.So as to reach free machining effect, heating and cooling step are iteratively repeated, can be promoted
Flaky carbide accelerates molten disconnected and nodularization in annealing, so as to accelerate nodularization speed, shortens the spheroidizing time.
The present invention can make intrapearlitic globular cementite in steel and proeutectoid cementite be changed into pelletiod,
It is uniformly distributed in ferrite matrix, so that the hardness of steel is low, machinability is good, cold deformability is big, facilitates the later stage
Machining.
Embodiments of the invention are the foregoing is only, are not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure or equivalent flow conversion that bright description is made, or directly or indirectly it is used in other related technology necks
Domain, it is included within the scope of the present invention.
Claims (3)
1. a kind of Technology for Heating Processing for effectively improving cutting rolled steel performance, it is characterised in that comprise the following steps that：Charging, pre-add
Heat, normalizing, water cooling, air-dried, preheating, annealing, air-cooled, discharging；Feed first, steel are sent into normalizing furnace, are pre-heated to
600 DEG C, 10min is kept, then carries out normalized treatment, the laggard water-filling of normalized treatment is cold, is air-dried after water cooling to normal temperature, air-dries
The steel are sent into annealing furnace afterwards, are first preheated to 500 DEG C, 30min is kept, then carries out spheroidizing, subsequent air-cooled, wind
After being cooled to normal temperature, discharging.
2. the Technology for Heating Processing according to claim 1 for effectively improving cutting rolled steel performance, it is characterised in that the normalizing
Processing stage, Control for Kiln Temperature keep 1.5h, then with 150 DEG C/h speed, are cooled to 300 DEG C at 950 DEG C.
3. the Technology for Heating Processing according to claim 1 for effectively improving cutting rolled steel performance, it is characterised in that the nodularization
Annealing stage, furnace temperature is promoted to 920 DEG C first, keeps 1h, furnace temperature is then reduced to 860 DEG C, 1h is kept, according to above-mentioned institute
State step cycle 4 times, furnace temperature is reduced to 500 DEG C, terminates spheroidizing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711008032.6A CN107502714A (en) | 2017-10-25 | 2017-10-25 | A kind of Technology for Heating Processing for effectively improving cutting rolled steel performance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711008032.6A CN107502714A (en) | 2017-10-25 | 2017-10-25 | A kind of Technology for Heating Processing for effectively improving cutting rolled steel performance |
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| CN107502714A true CN107502714A (en) | 2017-12-22 |
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| CN201711008032.6A Pending CN107502714A (en) | 2017-10-25 | 2017-10-25 | A kind of Technology for Heating Processing for effectively improving cutting rolled steel performance |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103522000A (en) * | 2013-09-27 | 2014-01-22 | 盐城金刚星齿轮厂 | Machine tool spindle blank processing method |
| CN104646975A (en) * | 2015-02-13 | 2015-05-27 | 湖南中联重科车桥有限公司 | Wheel rim speed reducer gear ring and manufacturing method thereof |
| CN105986090A (en) * | 2015-01-31 | 2016-10-05 | 重庆展申机械厂 | Heat treatment process for bearing steel |
-
2017
- 2017-10-25 CN CN201711008032.6A patent/CN107502714A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103522000A (en) * | 2013-09-27 | 2014-01-22 | 盐城金刚星齿轮厂 | Machine tool spindle blank processing method |
| CN105986090A (en) * | 2015-01-31 | 2016-10-05 | 重庆展申机械厂 | Heat treatment process for bearing steel |
| CN104646975A (en) * | 2015-02-13 | 2015-05-27 | 湖南中联重科车桥有限公司 | Wheel rim speed reducer gear ring and manufacturing method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 张贵锋等: "《固态相变原理及应用》", 30 November 2011, 冶金工业出版社 * |
| 王忠诚: "《热处理工使用手册》", 31 January 2013, 机械工业出版社 * |
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Application publication date: 20171222 |